From bats to whales to bees to frogs, wildlife health experts say, major mortality events happen every year for reasons that include bad weather, disease outbreaks and poisonings.

野生动物健康专家表示，从蝙蝠到鲸鱼再到蜜蜂和青蛙，每年都会由于包括恶劣天气、疾病暴发和中毒等原因发生重大死亡事件。

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Some snails and frogs do nothing but begin to have a long sleep when the weather is hot and dry.

有些蜗牛和青蛙在天气干燥炎热时就什么也不做，而开始长长的睡眠。

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Another is the deep bass-noted humming of the frogs - bull frogs and tree frogs - which began each Spring and continued until the cooler winter weather set in.

还有就是低回的蛙鸣——有牛蛙也有树蛙——从每年春季开始，一直可以持续到凉爽的冬季到来之前。

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